VK Handbook 37 3 wire Method

Started by Excalibrator, 12-08-2010 -- 15:39:15

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Excalibrator

Can anyone help with the equation for 3 Wire Method of Measuring Pitch Diameter Of Taper Pipe Threads?
Its in the Van Keuren Handbook 37.  Using the example for 1/2-14 NPT, I have no problems, but when checking any other size, I am missing something.  Can anyone help? Thanks